If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

why number 8549176320 is one of a kind?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

There is a place where if I stand up straight, I will still be considered sideways.

Find the missing number in the sequence below:

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

If your uncle’s sister is not your aunt, what relation is she to you?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

John is on an island and there are three crates of fruit that have washed up in front of him. One crate contains only apples. One crate contains only oranges. The other crate contains both apples and oranges.

Each crate is labelled. One reads 'apples', one reads 'oranges', and one reads 'apples and oranges'. He know that NONE of the crates have been labeled correctly - they are all wrong.

If he can only take out and look at just one of the pieces of fruit from just one of the crates, how can he label all of the crates correctly?

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?